Percussion mechanism device, in particular for an impact wrench
AssigneeRobert Bosch GmbH
InventorsChian Wah Lam, Sim Teik Yeoh
Life of this patent
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Abstract
A percussion mechanism device, in particular for an impact wrench, includes a drivable drive shaft that has at least one guide groove, an output shaft, and a percussion unit that includes an anvil coupled with the output shaft in a rotationally fixed manner, a hammer, and at least one ball. The hammer is supported via the at least one ball along the at least one guide groove on the drive shaft and includes an at least regionally concavely curved ball guidance area that has an axial clearance from the at least one ball at a radially innermost point that is greater than a radial clearance between the at least one ball and a radially innermost point of a concave ball guidance area of the at least one guide groove.
Claims11
A percussion mechanism device comprising:
- a drivable drive shaft that includes at least one guide groove;
- an output shaft;
- and
- a percussion unit that includes:
- an anvil coupled in a rotationally fixed manner with the output shaft;
- a hammer;
- and
- at least one ball, wherein the hammer:
- is supported via the at least one ball along the at least one guide groove on the drive shaft;
- and
- includes an at least regionally concavely curved ball guidance area that has an axial clearance in a direction toward a drive motor from the at least one ball at a radially innermost point that is greater than a radial clearance between the at least one ball and a radially innermost point of a concave ball guidance area of the at least one guide groove when the at least one ball is in a foremost position of the at least one guide groove and the hammer is in a foremost position,
- wherein the axial clearance from the radially innermost point of the concavely curved ball guidance area is more than three times as large as the radial clearance between the at least one ball and the radially innermost point of the concave ball guidance area of the at least one guide groove.
An impact wrench comprising a percussion mechanism device, the percussion mechanism device including:
- a drivable drive shaft that includes at least one guide groove;
- an output shaft;
- and
- a percussion unit that includes:
- an anvil coupled in a rotationally fixed manner with the output shaft;
- a hammer;
- and
- at least one ball, wherein the hammer:
- is supported via the at least one ball along the at least one guide groove on the drive shaft;
- and
- includes an at least regionally concavely curved ball guidance area that has an axial clearance in a direction toward a drive motor from the at least one ball at a radially innermost point that is greater than a radial clearance between the at least one ball and a radially innermost point of a concave ball guidance area of the at least one guide groove when the at least one ball is in a foremost position of the at least one guide groove and the hammer is in a foremost position,
- wherein the axial clearance from the radially innermost point of the concavely curved ball guidance area is more than three times as large as the radial clearance between the at least one ball and the radially innermost point of the concave ball guidance area of the at least one guide groove.
Dependencies are inferred from the claim text.